My girls don't look happy...please help!

Hi...I made this thread last week https://www.rollitup.org/general-marijuana-growing/311977-i-must-doing-something-wrong.html

I flushed them and I got rid of the nuts. I have filled the water tank with only ph6.5 water and a very small amount of vitalink bioplus (root mass increaser?).
They reacted really well but this morning I found them quite sad and brown-yellow in some leaves

they look over watered to me m8 what light you using the ph want to be a little lower around 5.8

Thanks for reply...using 250w hps. Can I regulate the water in NFT?

i use nft systems all the time and i always leave the pump on unless the light gose out then it get turned off. i have never had a overfeeding problem doing this.

i use vitalink bioplus but what i do is use vitalink grow A and B by look of ur plants i would use 2ml per 1lt and put bioplus in the water aswell and use superthrive so the plant aint stressed (superthrive 1ml per 4 n half lt. and leave them to take off.

set the ph at 5.5 cause the rockwool cube will raise the ph in 24hours the ph level can raise to 6.2 sometimes or higher i recomend 5.8 is the best in nft systems but keep an eye on the ph level for 3days cause you dont want to go higher than 6.5.